CN106170650A - Valve - Google Patents

Abstract

nullThe present invention relates to a kind of valve，It is with the valve chest (12) that can be flowed through by working media，The valve seat (17) around through-flow mouth (16) it is disposed with in valve chest，It is arranged in that the valve element (18) at main shaft (19) place is relevant to valve seat to be unified into so that valve element (18) can move by means of the adjustment stroke of main shaft (19) between locked position of coupler and open position，Valve seat (17) place is abutted in valve element (18) fluid-tight in locked position of coupler，And valve element (18) lifts from valve seat (17) in the open position，And wherein，It is disposed with interface (28) to be used for connecting the driver element adjusting stroke producing main shaft (19) at valve chest (12) place，And wherein，The sealing device (38) extended through by main shaft (19) is accommodated in valve chest (12)，It has by means of elastic element pretension、The black box (39) of the air locking at main shaft (19) place is clinged in the case of being included in sealing，Sealing device (38) is contained in separate with valve chest (12)、Being configured to can be in the sealing bellow (40) of the preassembled assembly of land used，Sealing bellow has the cartridge case body (41) that can be fastened on or be fastened to valve chest (12) place，Black box (39) and elastic element are contained in cartridge case body and black box (39) passes through elastic element relative to cartridge case body (41) flexibly pretension.

Description

Valve

Technical field

The present invention relates to a kind of valve, especially operating valve (Prozessventil), it is with the valve that can be flowed through by working media Housing, is disposed with the valve seat around through-flow mouth (Durchstroemoeffnung) in valve chest, is arranged in the valve unit at main shaft Part is relevant to valve seat to be unified into so that valve element can be at locked position of coupler by means of the adjustment stroke (Stellhub) of main shaft (Absperrstellung) and moving between open position, in locked position of coupler, valve element is not through working media ground hermetically Abut at valve seat, and valve element lift from valve seat in the open position, and wherein, be disposed with at valve chest interface for Connection produces the driver element adjusting stroke of main shaft, and wherein, accommodates the sealing extended through by main shaft and fill in valve chest Put, this sealing device have by means of elastic element pretension, be included in sealing in the case of cling to the sealer at main shaft The black box of part.

Background technology

Such as by the valve of the known a kind of the type of file EP 2 110 585 AI.So-called oblique seat disclosed there Valve has valve chest, and it can be flowed through by working media.Valve seat it is configured with, its limit current mouth in valve chest.Valve seat is associated with Potted component, it carries by main shaft, main shaft at its that aspect by pneumatic servo-driver (Stellantrieb) by can line Property motion ground drive, thus can selectively open or close through-flow mouth by potted component.For such bevel seat valve feature It is that the valve seat strutted by valve seat favours the flow direction orientation of working media.This causes, and the orientation of main shaft also favours work The flow direction making medium extends and adjusts stroke and be orientated the most obliquely.In aforementioned prior art at valve chest structure Having made interface, it is for connecting pneumatic driver element.This is provided with pipe, and it is screwed into obliquely from its remaining part of valve chest Divide in the adapter stretched out.This pipe is the ingredient of pneumatic servo driver, because the cylinder body of pneumatic servo driver is fastened on At pipe end, this pipe end is contrary with the pipe end being screwed in valve chest.This is had bigger relative to the remainder diameter of pipe by this pipe Fastening section, this fastening section also forms the cover region section of cylinder shell simultaneously, adds by means of compressed air again in cover region section Carrying movably guided has piston, and wherein, the inside of cylinder body is divided into two chambeies by this piston.This pipeline additionally has another mesh , i.e. it is used for accommodating sealing device, and this sealing device has with the shape of ridge piston ring group (Dachmanschettenpaket) The black box of formula, this ridge piston ring group carrys out pretension via the spring being similarly positioned in pipe.

Due to the lifting campaign of main shaft, the ridge piston ring abrasion of ridge piston ring group, thus it is required to be changed.But Whole pneumatic servo driver must be pulled down from valve chest to change air locking.The most additionally must also be by this pipe with pneumatic The remainder of servo-driver separate, in order to make the sealing device can be close.This is extremely complex.

In addition by the known a kind of bevel seat valve of file DE 22 52 532.The disclosedest bevel seat valve has with for joining The valve chest of the interface of the servo-driver that stagnation of QI is dynamic.Be provided with carrying sleeve (Tragbuchse) at this, it is stretched by valve main shaft Cross and ridge piston ring group is received into wherein.Carrying sleeve is inserted in the adapter of valve chest, wherein, is provided with and exists with structure The axial stop of the annular convex shoulder form at adapter.Carrying sleeve has for connecting connecing of pneumatic servo driver at its aspect Mouthful.Before carrying sleeve is introduced in adapter, servo-driver is fitted together with carrying sleeve, wherein, with carrying sleeve Separate packing ring abuts at the upside of carrying sleeve.Carrying sleeve is being inserted adapter together with pneumatic servo-driver Axial restraint is realized by locking nut (Ueberwurfmutter) in case from adapter axially-movable out, this locking after in Nut is screwed onto on structure external screw thread at adapter.

In order to change sealing member, must first unclamp locking nut and by carrying sleeve together with pneumatic servo-driver one Rise and pull down from valve chest.Carrying sleeve difficultly is removed from main shaft afterwards.

Summary of the invention

Therefore it is an object of the invention to provide a kind of valve starting mentioned type, its I& M can be with simply Mode implement, especially should be able to change sealing member easy to wear in a straightforward manner.

This purpose is realized by a kind of valve with the feature of independent claims 1.Illustrate in the dependent claims The improvement project of the present invention.

Valve according to the present invention is characterised by, sealing device be contained in separate with valve chest, be configured to can land used prepackage In the sealing bellow (Dichtungspatrone) of the assembly joined, sealing bellow has the cartridge case that can fasten or be fastened at valve chest Body, in cartridge case body, black box is received into elastic element and makes black box pass through elastic element relative to cartridge case body bullet Property ground pretension.

Valve chest, sealing bellow and the driver element connect are i.e. the construction units of structure separated from one another, and it can be with letter Single and quick mode carrys out assembly and disassembly.It is possible to quickly and the most cost-effectively change sealing member easy to wear.

Because sealing bellow is preassembled assembly, it comprises all parts of sealing device, it is only necessary to change sealing bellow itself, And be not necessary to take sealing bellow self apart.Sealing bellow can be replaced with another sealing bellow on the whole at it.

In the improvement project of the present invention sealing bellow have fastening interface be fastened at valve chest for its self-locking.The most not Need other fastening additional device to be assemblied in by sealing bellow at valve chest or to dismantle when needed.

Fastening interface particularly preferably constructs at cartridge case body.

It is particularly preferred that fastening interface includes screw thread, it enables sealing bellow to be screwed in valve chest, this can especially quickly and Implement simply.But also contemplate for other fastening means in principle for being fastened at valve chest by sealing bellow, such as block Lock connects, hasp connects or clamping connects (Spannverbindung).

In the improvement project of the present invention, cartridge case body has the receiving section for accommodating black box and elastic element, Wherein, receiving section has encirclement black box and the enclosing region (Huellbereich) of elastic element and is provided with center through hole (Durchgangsloch) bottom section.It is possible that bottom section place within it has the conical surface, this conical surface exists with structure The cooperation conical surface of the outside of black box complementally constructs, and wherein, the diameter of through hole is so more than the end of black box The external diameter in region so that black box due to the conical surface complimentary to one another and by means of tension force produced by elastic element extend through this lead to Hole and terminating outside enclosing region with its free end.The potted component of the side of black box is suitably formed strigil (Abstreifer), its dirt or working media being positioned on the main shaft of motion of swiping.

In the improvement project of the present invention cartridge case body have that be connected with receiving section, be provided with for main shaft by mouth (Durchgangsoeffnung) cover region section, fastening interface configurations is at cover region section.

Aptly, cover region section is configured to column.The most preferably at the lateral circle surface of column cover region section (Mantelflaeche) place is configured with external screw thread for being screwed in valve chest.

In the improvement project of the present invention, cover region section has towards receiving section, the supporting surface that is oriented radially, elastic Device support is at this supporting surface.The cover region section of cartridge case body is multi-functional, because fastening interface configurations (connects at this cover region section Mouthful function) and elastic element be also supported at this cover region section (support function).

It is particularly preferred that cover region section and receiving section are connected with each other inseparably.It is made up of cover region section and receiving section Inseparable unit can abnormal cost be advantageous to manufacture because can abandon in this case for connecting cover region Duan Yurong Receive the connector of section.It addition, this inseparable unit prevents from separately assembling sealing bellow, thus eliminate replacement and be located therein Black box and reuse same sealing bellow.This can be the most time-consuming.Be made up of cover region section and receiving section is inseparable From unit the most forcibly specify, must replace sealing bellow with new sealing bellow, wherein, sealing bellow to be replaced can be cleaned Or recycle.

In the improvement project of the present invention, sealing device have with black box separate construction, hermetically cling to main Sealing unit at axle, this sealing unit positions axially-spacedly with black box.Two are positioned at the row along main shaft Sail the assembly in other words of the sealing unit at the different parts in path such layout provide dual-seal, i.e. valve side towards work Make the sealing of medium and the sealing towards control medium of driving side.This is particularly effective, because preventing working media to overflow Go out or dirt enters in working media.

It is particularly preferred that sealing unit has clings at least one of sealing lip at main shaft hermetically with at least one The potted component of individual annular.It is particularly preferred that be provided with the sealing lip that at least two is the most axially-spaced.Aptly, seal This at least one sealing lip of unit performs the function of strigil equally.With the black box of strigil with strigil The combination of sealing unit provides the particularly effective probability of main shaft decontamination as dual strigil.

In the improvement project of the present invention, sealing unit is arranged in the cover region section of cartridge case body.At potted component by elasticity Body material constitute in the case of its can make by oneself heart be fastened at cover region section in this set receiving portion.

In the improvement project of the present invention, valve chest is built into multi-piece type, and it is with the fluid guide part with valve seat And the interface unit of the open column shape with fluid guide part separate construction, interface unit is with for connecting connecing of driver element Mouthful.Generally, this obtains the modular of valve chest because interface unit can be replaced when needed and can be suitable for and Determine that other interface unit for connecting other driver elements is replaced.

Aptly, interface unit is releasably fastened at fluid guide part.In the case of nominal width is less, energy Be can, interface unit and fluid guide part are embodied as one piece, and it is such as made up of founding materials.

It is particularly preferred that releasable between interface unit with fluid guide part is connected via screw engagement real Existing, this screw engagement especially has structure external screw thread at interface unit and structure at the connection section of fluid guide part Female thread.

It is particularly preferred that sealing bellow is contained in this interface unit and is releasably fastened on there.

Accompanying drawing explanation

A preferred embodiment of the present invention is shown in the drawings and next illustrates in detail.In the accompanying drawings:

Fig. 1 shows the perspective view of the preferred embodiment of the valve according to the present invention,

Fig. 2 shows the front view of the valve of Fig. 1,

Fig. 3 shows the vertical section along the line III-III in Fig. 2 through this valve,

Fig. 4 show the exploded view in the vertical section of the parts of the valve according to Fig. 3 and

Fig. 5 shows the enlarged drawing of details X in Fig. 4.

Detailed description of the invention

Fig. 1 to 5 shows the preferred embodiment of the valve 11 according to the present invention.Valve 11 is suitable for being used as processing industry In operating valve.

As shown in the most in figures 1 and 3, valve 11 has valve chest 12, in valve chest between entrance 13 and outlet 14 It is extended with percolation passage 15.

In the case of application in the food industry, valve chest is made up of rustless steel aptly.If using aggressivity thing Matter, such as acid as working media, valve chest is aptly by the plastics relative to such material with bigger chemoresistance Constitute.

In percolation passage 15 entrance 13 and outlet 14 between there is through-flow mouth 16, its by annular valve seat 17 around. Aptly, valve seat 17 is designed to annular.But also contemplate for the valve seat of ellipse in theory.

Valve seat 17 is associated with valve element 18, and it is arranged at main shaft 19 at its aspect.

Illustrating and have dish 20 in this case valve element 18 exemplarily only multi-piece type, this dish is provided with through hole 21, The end section 22 of main shaft can be inserted through this through hole.This dish such as welds mutually with main shaft.Belong to valve element 18 in addition with cooperation Part 23, it is provided with blind-hole type utensil receiving opening 24, and this utensil receiving opening is provided with female thread 25.To this complementally in the end section 22 of main shaft 19 There is external screw thread 26 in place, can be screwed in the end section 22 of main shaft 19 with this counterpart 23.Open between counterpart 23 and dish 20 Tightly having the sealing ring 27 of annular, it is made up of plastics, such as PTFE aptly.

Valve element 18 can move by means of the adjustment stroke of main shaft 19 between locked position of coupler and open position (Fig. 3), In locked position of coupler, valve element 18 abuts at valve seat with its sealing ring 27 fluid-tight, and valve element 18 is from valve in the open position Seat 17 lifts.The adjustment stroke of main shaft 19 is produced by driver element (not shown state), this driver element by structure at valve Interface 28 at housing 12 connects.Driver element can be fluid, the most pneumatic driver element.In the feelings finally mentioned In condition, the adjustment stroke of main shaft 19 such as can produce by adding the working cylinder of carrying object pressure.Alternatively however it is also possible that It is that driver element is configured to electric drive unit.

As especially can pick out in figure 3, valve chest 12 is built into multi-piece type.Valve chest 12 has fluid and guides Parts 29, percolation passage 15 and valve seat 17 construct in this fluid guide part.It addition, valve chest 12 has interface unit 30, Construct at this interface unit for connecting the interface 28 of driver element.Interface unit 30 is configured to open column shape and has multiple Function section.In these function sections one is the fixing section 31 of column, is configured with external screw thread 32 at its lateral circle surface.With This external screw thread 32, thus can be by interface unit to there being structure female thread 34 at the fixing adapter 33 of fluid guide part 29 30 are screwed on fluid guide part 29.The most also interface unit 30 can be removed simply from fluid guide part 29, in order to example As replaced it with the interface unit 30 with other interfaces 28.It is possible that interface unit in the case of nominal width is less 30 and fluid guide part 29 be embodied as the component of single type, it is such as made up of founding materials.

In addition there is the cannelure of cincture in the lateral surface of fixing section 31, sealing ring 35 is placed in this cannelure And it is fixed on there.This outer seal ring 35 is responsible for the sealing between interface unit 30 and fluid guide part 29.

Being at inside circumference at fixing section 31 and there is other cannelure, inner seal ring 37 is placed in this cannelure And it is fixed on there.

Other function section as interface unit 30 can be mentioned that interface section 36, interface 28 construct at this interface section Place.This interface section is connected with fixing section 31 single type ground, but has bigger diameter relative to fixing section, thus Annular convex shoulder at structure transition part between interface section 36 and fixing section 31 forms backstop, and it abuts to fluid and guides At the fixing adapter 33 of parts 29 and therefore regulation interface unit 30 be screwed into the degree of depth.

Additionally belong to valve 11 has the sealing device 38 extended through by main shaft 19, its have by means of elastic element pretension, The black box 39 of air locking at main shaft 19 is clinged in the case of being included in sealing.

Sealing device 38 be contained in that separate with valve chest 12, being configured to can the sealing bellow 40 of the preassembled assembly of land used In.

As shown in the most in Figure 5, sealing bellow 40 has the cartridge case body 41 that can fasten or be fastened at valve chest 12, close Sealing assembly 39 and elastic element are contained in this cartridge case body.

Cartridge case body 41 has multiple function section.It is provided with receiving section 42 for accommodating black box 39 and elastic device Part.Receiving section 42 is designed to cup type and has encirclement black box 39 and the enclosing region 43 of elastic element and be provided with The bottom section 45 of centre through hole 44.

Black box exemplarily illustrates with the shape of ridge piston ring group, wherein, is provided with many as each potted component The ridge piston ring 46 of the individual annular being stacked the most each other.As shown in the most in figures 4 and 5, ridge piston ring 46 is at cross section In be designed to approximate V-arrangement and Straddle riding type ground be stacked each other so that ridge piston ring 46 when pressure-loaded radial expansion and because of This clings at main shaft 19 with being responsible for fluid-tight.The extruding force of ridge piston ring 46 is produced by elastic element noted above, Elastic element include compression spring 47 and its next in the way of also elaborating, be responsible for the pretension of whole ridge piston ring group.

As shown in the most in Figure 5, black box 39 comprises strigil 70, and it is associated with bottom section and is bearing in There.Strigil 70 is made up of plastics equally, but these plastics can more construct by hard place relative to the plastics of ridge piston ring.Scraping Device 70 has the base section 71 of open column shape, protrudes upward ring-type supporting in its end protruding (Lagerhoecker) 73, it is bearing in this supporting projection with being arranged in ridge piston ring 46 Straddle riding type on this.There is lip section in the axial direction (Lippenabschnitt) 72 be connected at base section 71, lip section have at its outer peripheral edge cooperation the conical surface 48, its with The structure conical surface 49 at the inner side of bottom section 45 acts on jointly.

Other function section as cartridge case body 41 can be mentioned that cover region section 50, its have for main shaft by mouth 51. There is fastening interface 52 at cover region section, it illustrates the most in detail.This cover region section 50 is designed to column and leads to it Cross mouth 51 and there is cannelure 53 with one heart, the end section of the enclosing region 43 of receiving section 42 sink in cannelure 53 and There is connected with cover region section 50.Aptly, receiving section 42, i.e. enclosing region 43 are welded with cover region section 50 phase.Cover region section 50 Structure form supporting surface 54 at cannelure 53 and by the annular end face between mouth 51, compression spring 47 is supported on this supporting surface Place.The end opposite of compression spring 47 is supported at the support ring 55 being movably supported in enclosing region 43, and this support ring is such as Packing ring can be configured to.Support ring 55 is pressed onto in ridge piston ring group by compression spring 47, thus make itself and ridge piston ring 46 towards Pretension on the direction of bottom section 45.Compression spring 47 be responsible for radially expanding and ridge piston ring group of ridge piston ring 46 by pressure Axially displaced.Owing to the through hole 44 in bottom section 45 is more than the external diameter of main shaft 19, the lip section 72 of strigil 70 A part may pass through through hole 44, thus it terminates at segment distance as shown in FIG. 5 outside receiving section.Lip section 72 Aforementioned cyclic part therefore, it is possible to scraping or remove and be positioned at dirt at main shaft 19, working media etc..

Additionally fasten in the region by mouth 51 in cover region section 50, such as press-in has axle sleeve 55, and it is used for can be axial The supporting of main shaft 19 of motion and radially fixed.

Sealing device 38 includes sealing unit 56 in addition to black box 39 in addition, itself and black box 39 structure dividually Make.Sealing unit 56 includes the potted component 57 of at least one annular, and it is fastened on as this ring-type in cover region section 50 of structure Supporting cavity 58 in.Potted component 57 is made up of elastomeric material.Potted component 57 such as have two the most axially-spaced Sealing lip 59a, 59b, it abuts at the outer peripheral edge of main shaft 19 hermetically and is therefore responsible for fluid-tight sealing.Remove Outside sealing function, sealing lip 59a, 59b also have other function, i.e. it is used as strigil accordingly, is therefore prevented from From environment or by controlling in the dirt arrival working media that medium is brought into.

Sealing bellow 40 i.e. provides dual-seal, that is for the sealing of working media with for controlling medium or for environment Sealing.It addition, sealing bellow 40 provides dual strigil.

In the assembling of valve 11 as seen from Figure 4, in a rapid and simple manner by different module assembleds together.First First being inserted by main shaft 19 in the fluid guide part 29 of valve chest 12, this spindle design Cheng Keyu driver element separates.Afterwards may be used Interface unit 30 is screwed on fluid guide part 29.Finally sealing bellow 40 can be screwed in interface unit 30.Alternatively, it is possible to Sealing bellow 40 was screwed in interface unit 30 before interface unit 30 is fastened at fluid guide part 29.Finally, logical Cross and driver element is tightened at the interface 28 with interface unit 30 for these set parts, driver element can be connect. Driver element fastening at interface 28 is not dependent on sealing bellow 40.I.e. sealing bellow is not required for the connection of driver element 's.Correspondingly, by making driver depart from from interface 28 and be backed out from interface unit 30 by sealing bellow 40, can very simple and The dismounting of valve 11 is performed quickly, such as in order to change sealing bellow 40.

Claims (15)

1. a valve, it is with the valve chest (12) that can be flowed through by working media, is disposed with around logical in described valve chest The valve seat (17) of head piece (16), is arranged in that the valve element (18) at main shaft (19) place is relevant to described valve seat to be unified into so that described valve unit Part (18) can move, in described locking by means of the adjustment stroke of described main shaft (19) between locked position of coupler and open position Valve element described in position (18) is not through working media ground and abuts in described valve seat (17) place hermetically, and opens position described Valve element described in putting (18) lifts from described valve seat (17), and wherein, is disposed with interface at described valve chest (12) place (28) it is used for connecting the driver element adjusting stroke producing described main shaft (19), and wherein, in described valve chest (12) Accommodate the sealing device (38) extended through by described main shaft (19), described sealing device have by means of elastic element pretension, The black box (39) of the air locking at described main shaft (19) place is clinged to, it is characterised in that institute in the case of being included in sealing State sealing device (38) be contained in separate with described valve chest (12), being configured to can the sealing bellow of the preassembled assembly of land used (40), in, described sealing bellow has the cartridge case body (41) that can be fastened on or be fastened to described valve chest (12) place, described close Sealing assembly (39) and described elastic element are so contained in described cartridge case body so that described black box (39) passes through described bullet Property device is relative to described cartridge case body (41) flexibly pretension.

Valve the most according to claim 1, it is characterised in that described sealing bellow (40) has and is fastened on institute for its self-locking State the fastening interface (52) at valve chest (12) place, wherein it is preferred to described fastening interface (52) constructs described cartridge case body (41) Place.

Valve the most according to claim 2, it is characterised in that described fastening interface (52) includes screw thread, wherein it is preferred to set It is equipped with the external screw thread (32) constructing the outer surface described cartridge case body (41).

4. according to the valve according to any one of the claims, it is characterised in that described cartridge case body (41) has for accommodating The receiving section (42) of described black box (39) and described elastic element, wherein, described receiving section (42) has encirclement institute The enclosing region (43) stating black box (39) and described elastic element and the bottom section of the through hole (44) being provided with central authorities (45)。

Valve the most according to claim 4, it is characterised in that described bottom section (45) place within it has the conical surface (49), the described conical surface complementally constructs with the structure conical surface (48) that coordinates in the outside of described black box (39), wherein, The diameter of described through hole (44) is so more than the external diameter of the end regions of described black box (39) so that described black box (39) due to the conical surface (48,49) complimentary to one another and described through hole is extended through by means of pretension produced by described elastic element (44) and with its free end terminate outside described enclosing region (43).

6. according to the valve described in claim 4 or 5, it is characterised in that described cartridge case body (41) has and described receiving section (42) that be connected, be provided with the cover region section (50) by mouth (51) for described main shaft (19), described fastening interface configurations exists At described cover region section, wherein it is preferred to described cover region section (50) is configured to column and constructs described outer spiral shell at its lateral circle surface Stricture of vagina (32) is used for being screwed in described valve chest (12).

Valve the most according to claim 6, it is characterised in that described cover region section (50) has towards described receiving section (42) Supporting surface (54), described elastic element is supported at described supporting surface.

8. according to the valve described in claim 6 or 7, it is characterised in that cover region section (50) and receiving section (42) are inseparably It is connected with each other, is especially welded to each other.

9. according to the valve according to any one of the claims, it is characterised in that described sealing device (38) has with described That black box (39) constructs discretely, cling to the sealing unit (56) at described main shaft (19) place hermetically, described seal single First and described black box (39) positions axially-spacedly, wherein it is preferred to described sealing unit (56) has with at least The potted component (57) of at least one annular of one sealing lip (59a, 59b) clinging to described main shaft (19) place hermetically.

Valve the most according to claim 9, it is characterised in that annular described potted component (57) have at least two that This axially-spaced sealing lip (59a, 59b).

11. according to the valve described in claim 9 or 10, it is characterised in that described sealing unit (56) is arranged in described cartridge case body (41) in cover region section (50).

12. according to the valve according to any one of the claims, it is characterised in that described valve chest (12) is configured to more than one piece Formula, it is with the fluid guide part (29) with described valve seat (17) and the sky constructed discretely with described fluid guide part The interface unit (30) of stem shape, described interface unit is with the interface (28) for connecting described driver element.

13. valves according to claim 12, it is characterised in that described interface unit (30) is releasably fastened on described stream Body guide member (29) place.

14. valves according to claim 13, it is characterised in that between interface unit (30) and fluid guide part (29) Releasable connection realize via screw engagement, described screw engagement especially have structure at described interface unit (30) place External screw thread (32) and structure described fluid guide part (29) connection section at female thread.

15. according to the valve according to any one of claim 12 to 14, it is characterised in that described sealing bellow (40) is received into institute State in interface unit and be releasably fastened on there.